A tweezer clock with half-minute atomic coherence at optical frequencies and high relative stability
| Autor: | Young, Aaron W., Eckner, William J., Milner, William R., Kedar, Dhruv, Norcia, Matthew A., Oelker, Eric, Schine, Nathan, Ye, Jun, Kaufman, Adam M. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Nature 588, 408-413 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41586-020-3009-y |
| Popis: | The preparation of large, low-entropy, highly coherent ensembles of identical quantum systems is foundational for many studies in quantum metrology, simulation, and information. Here, we realize these features by leveraging the favorable properties of tweezer-trapped alkaline-earth atoms while introducing a new, hybrid approach to tailoring optical potentials that balances scalability, high-fidelity state preparation, site-resolved readout, and preservation of atomic coherence. With this approach, we achieve trapping and optical clock excited-state lifetimes exceeding $ 40 $ seconds in ensembles of approximately $ 150 $ atoms. This leads to half-minute-scale atomic coherence on an optical clock transition, corresponding to quality factors well in excess of $10^{16}$. These coherence times and atom numbers reduce the effect of quantum projection noise to a level that is on par with leading atomic systems, yielding a relative fractional frequency stability of $5.2(3)\times10^{-17}~(\tau/s)^{-1/2}$ for synchronous clock comparisons between sub-ensembles within the tweezer array. When further combined with the microscopic control and readout available in this system, these results pave the way towards long-lived engineered entanglement on an optical clock transition in tailored atom arrays. Comment: 11 pages, 5 figures (main text); 17 pages, 7 figures (supplemental materials) |
| Databáze: | arXiv |
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